SAE J1633-2000 pdf download Laboratory Speed Test Procedure for Light Truck Tires
Scope-This SAE Recommended Practice provides a method for testing the speed performance of light trucktires under controlled conditions in the laboratory on a test wheel.
References_There are no referenced publications specified herein.
Definitions
3.1 Ambient Temperature–This is the temperature of the air measured during a high-speed test at a fixeclocation near the tire. The fixed location of ambient temperature measurement is defined as a point on therotational axis of the tire. 0.31 m (12 in) from the plane touching the nearest tire sidewall (or a point where anequivalent temperature exists).
Capped lnflation Pressure–The process of inflating the tire to a specified pressure and allowing the inflation3.2pressure to build up, as the tire temperature increases during the test procedure.
3.3 Maximum Load–The maximum load (Pound load, Kilogram load, or Load index) that is molded on the tiresidewall, or if not molded, shown in the publication of a recognized tire standardizing body.
3.4 Load Index-A numerical code associated with the maximum load a tire can carry at the speed indicated byits Speed Symbol under specified service conditions.
3.5Service Description-A service designation, which s distinct from the size designation, consisting of theLoad Index (Single load/Dual load, where applicable) and Speed Symbol.
3.6Speed Category-A category assigned to a tire which denotes the maximum speed for which the use of thetire is rated
3.7 Speed Symbol—A symbol indicating the speed category at which the tire can carry a load corresponding to its Load Index under specified service conditions (see Table 1 ).
3.8 Chunking—The breaking away of pieces of the tread or sidewall.
3.9 Cord Separation—The parting of cords from adjacent rubber compounds.
3.10 Cracking—The parting within the tread, sidewall, or inner liner of the tire extending to cord material.
3.11 Innerliner Separation—The parting of the innerliner from cord material in the carcass.
3.12 Tread Separation—The pulling away of the tread from the carcass.
3.13 Sidewall Separation—The parting of the rubber compound from the cord material in the sidewall.
3.14 Ply Separation—The parting of the rubber compound between adjacent plies.
3.15 Bead Separation—A breakdown of the bond between components in the bead area.
4. Test Equipment
4.1 Test Wheel Specifications
4.1 .1 D IAMETER —The diameter of the Standard test wheel used for the high-speed test is 1 .708 m (67.23 in). An optional test wheel of 2.0 m (78.74 in) diameter may also be used.
4.1 .2 W IDTH OF THE T EST S URFACE —This must exceed the tread width of the test tire.
4.1 .3 O UTER S URFACE —Smooth steel.
4.2 Test Rim—It must have a contour and width as shown in the publication of a recognized standardizing body
for the tire size to be tested.
4.3 Control Accuracy—Operating conditions must be maintained within the following accuracies:
a. Test Load: ±1 %
b. Speed: +2, −0 km/h (+1 , −0 mph)
SAE J1633-2000 pdf download
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